Well we've tested it and I'm happy to say it works. Our almost 2 year old got wet in diapers and vomited on this thing and it continues to protect his mattress. We bought an extra bed for his bed so we could have a spare bed while the first one got washed. We always air dry to protect the waterproof layer and so far so good. We even bought one for our own bed as it always seems like we have at least one child with us. The pocket is very deep - deep enough for our double pillowcase with two memory foam pads on it, but not too deep for our son's pillowcase. It's also very quiet. There is absolutely no plastic sound in it; we don't even realize he's there.
Biloban Box Spring Cover (4/5/7/9/13/17Inches) Twin, High Profile Waterproof Mattress Protector, 6 Sides Wrapping Zippered Mattress Encasement Cover
34 Review
Waterproof Twin XL Mattress Encasement With Zippered 6-Sided Cover, PlushDeluxe Premium Quality, And Cotton Terry Surface (Fits 12-15 Inches H)
14 Review
Protect And Comfort Your Mattress With FeelAtHome 100% Waterproof Fitted Cover For Twin Size - Soft & Noiseless Cotton Terry Fabric
18 Review
Twin Size Zippered Mattress Protector Encasement - Premium Terry Absorbent Cover With Six-Sided Waterproof Protection - Quiet, Breathable, And Fully Washable
43 Review
Small Seagrass Belly Basket By BlueMake - Perfect For Storage, Plant Pot, Laundry, Picnic & Grocery!
41 Review
Gulrear Portable AC Window Seal Kit - White 400CM/158Inch Hot Air Stop Exchange Guards With Zipper And Adhesive Fastener
38 Review
Black 2-Pack Of Vivere EFHTS Accessories For Hammocks
27 Review
Stylish Bracelet Replacement Band With Diamonds For Fitbit Versa 2 Smart Watch - Compatible With Fitbit Versa, Versa Lite, And Versa 2 Bands For Women - Silver
28 Review